Signal and switch apparatus for telephones



(No Model.) 4 Sheets-Sheet l W. J. DUDLEY. Signal and Switch Apparatusfor Telephones- No. 2 4,663. Patented Nov. 23,1880.

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(No Model.) 4 Sheets-Sheet 2 W. J. DUDLEY. Signal and Switch Apparatusfor Telephones- No. 234,663. Patented Nov. 23,1880.

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RPEI'ERS, PHOTD-UTHOGRAFHER. WASHINGTON. D C.

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W. J DUDLEY. Signal and Switch Apparatus for Telephones- No. 234,663.Patented Nov. 23,1880.

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NJETERS. FNOTO-UTNDGRAPHER, WASHWGTON D C.

UNITED STATES PATENT OEEie \VALTER J. DUDLEY, OF BOSTON, MASSACHUSETTS.

SIGNAL AND SWITCH APPARATUS FOR TELEPHGNES.

SPECIFICATION forming part of Letters Patent No. 284,663, dated November23, 1880,

Application filed April 16, 1880.

To all whom it may concern Be it known that I, WALTER J. DUDLEY, of thecity of Boston, State of Massachusetts, have invented Improvements inElectrical Apparatus for TransmittingMessa ges, of which the followingis a specification.

This invention relates to that class of instruments or apparatus and theconnections through which, by means of electric currents, messages aretransmitted, either orally, by sounds, signs, or by means ofrecording-characters; and the objects of my invention are, first, todispense with all batteries upon a line except at the central or mainstation, except such relay-batteries as the extended length of the linemay render necessary; second, to sound the alarm-call at any desiredoifice upon a line connected by a single wire, and not sound such callat any ofice except that for which it is intended; third, to enable anyminor office upon the line to call the central ofiice without disturbingor sounding such call in any minor office; fourth, indicat, ing by adial and pointer or other means at every ofice whether the line is inuse or not; fifth, indicating at the calling-office whether its call hasbeen correctly received at and transmitted from the main office; sixth,when a mes sage is sent from one office to another, to prevent thereception of the same at any omce except that for which it is intendedseventh, to dispense with the main office, if deemed advisable, and insuch case enabling each minor office to signal and transmit messages tothe other offices without the aid of a main office 5 and myinventionconsists in certain of the instruments and apparatus shown in theannexed drawings,and in the combinations and arrangements thereof, allas will be hereinafter fully explained.

Figure 1 is a top or plan view of the polechanger, which I employ in themain office when there is such an office uponthe line, and which isemployed in each office upon theline when the main office is dispensedwith. Fig. 2 is an inverted or under-side plan view of saidpole-changer. Fig. 3 is a top or plan view of my improved indicator andautomatic switch, which I employ in the main office and also in eachminor ofiice on the line. Fig. etis an end view of Fig. 3 as viewed fromthe top thereof (No model.)

in said Fig. 3. Fig. 5 is a side elevation, as viewed from the left-handof Fig. 3, the dialplate and its supportiug-standard being removed. Fig.6 is a side elevation as viewed from the right in Fig 3, the standardwhich supports the ratchet-arbor being broken away. Fig. 7 is asideelevation similar to Fig.6, but with the telephone-lever, itsconnecting-disk, the closed circuit-key, one of the helices, one of thestandards of the automatic lever, the right-hand side of the support inwhich are arranged the stops of said lever, and the righthand support ofthe ratchet-arbor all omitted or broken away the better to show theinterior parts.

The views on Sheet 9: show the method of arranging and connecting theapparatus of the main ofice with minor offices upon the line.

I will first describe the circuit-interruptin g and pole-changinginstrument shown in Figs. 1 and 2, in which A represents the usualnonconductiug bed, to which the other parts are attached, whereof 1 isthe pole-changing lever, which is rigidly secured to shaft17,upon whichis secured cam 41 of the pole-changing devices to be described. Theelastic key2 is secured to bed A beneath bracket 3, in which latter isthreaded the usual adjustable contact-screw 4.

The stops 5 and 6 are arranged to arrest the vibrating lever 1 whenactuated in either direction for the purpose of reversing the current.Cup 7 receives line-wire 10. Cup 8 receives wire 11, which grounds at42. Cup 9 receives positive wire 12, connecting with battery 13, and cup210 receives negative wire 14, which also connects with battery 13. Theforegoing parts are shown in the top or plan view, Fig.1.

In the inverted or under-side view, Fig. 2 the cam ellis shown securedupon shaft 17,which is actuated by lever 1, as stated, and whichactuates the four springs next to be described. Spring 22 is secured toblock 23, spring 24 is secured to block 255, sprin 26 is secured toblock 27, and spring 28 is secured to block 29, each of said blocksbeing secured to bed A, as shown, and thereby securing said springs inposition.

A block, 30, secured to bed A, has threaded in it two adjustablecontactscrews, 31 and 32, and is itself connected by wire 43 to cup 10,as shown. A similar block, 33, has threaded in it the two adjustablecontact-screws 34 and 35, and is itself connected with cup 9 by wire 44,as shown.

A crank, 15, is secured to and serves to rotate shaft 16, which ismounted in bearing 40, and on which is rigidly secured cylinder 18, theperiphery whereof is divided into four sections of ninety degrees each,two of which (shown at 19) represent contact and two (marked 20)represent insulation, and as said cylinder 18 is so rotated the elasticcontactspring 21, which rests upon said cylinder, will make and breakcontact twice in each revolution of said cylinder.

A switch-spring, 36, secured to block 37 at one extremity, is arrangedto be forced into contact with adjustable screw 38 by cam 41 when thelatter is in a central position, as shown in Fig. 2, and to be releasedfrom said screw when lever I is in contact with either stop 5 or 6, Fig.1, and a wire, 45, connects stud 39 (in which contact-screw 38isthreaded) with cup 8, which is in contact with blocks 27 and 29, asshown.

A wire, 46, connects spring 21 and cup 7, while a wire, 47, connectssaid cup with bracket 3 of Fig. 2, and a branch wire, 48, connects wire47 with switch-spring 36, and a wire, 49, connects bearings 40 withblock 23, while a wire, 50, passingthrough bed A, connects key 2 withblock 25.

When lever 1 is in the position shown in Fig. 1, cam 41 being thereby ina central or neutral position, the line and ground wires are connectedas follows: From ground 42 wire 11 leads to cup 8, thence wire 45 leadsto stud 39, thence by its screw 38 and spring 36 to blocks 37, thence bywires 48 and 47 to cup 7, with which line-wire 10 connects, as beforestated.

In order to transmit a positive current through the circuit, lever 1 ismoved into contact with stop 6, thereby bringing spring 22 into contactwith screw 34 and spring 28 with screw 31, and at the same timereleasing spring 36 from screw 38, when the current will flow throughthe following conduits: From battery 13 by wire 12 to cup 9, thence bywire 44 to block 33, thence by screw 34 and spring 22 to wire 49, thenceby said wire to bearings 40, thence by said bearin gs to shaft 16,thence to metallic cylinder 18, thence to contact-spring 21 when saidspring is not insulated upon sections 20, thence by wire 46 to cup 7,thence by line-wire 10 to minor stations, returning by ground-wire 11 tocup 8, thence by spring 28 to screw 31, thence through block 30 and wire43 to stud 210, thence by wire 14 to battery.

In order to transmit a negative current through the circuit, lever 1 ismoved into contact with stop 5, thereby causing cam 41 to bring spring24 in contact with screw 32 and spring 26 in contact with screw 35, andalso 1 releasing spring 36 from contact with screw 38, when the currentwill flow through the following conduits: From battery 13 by wire 14 tocup 210, thence by wire 43, block 30, screw 32, spring 24, and wire 50to key 2, thence by bracket 3 and wire 47 to cup 7, thence by linewire10 to minor stations, returning through ground-wire 11, cup 8, spring26, screw 35, block 33, wire 44, cup 9, and wire 12 to said battery 13.

In Figs. 3 to 7, which, as stated, are views of theindicator andautomatic switch, B is the non-conducting bed-plate on which the severalparts are mounted, first among which are the helices 51 and 52, (of anelectro-magnet,) which are mounted and arranged in the usual manner. Avibrating lever, 53, carrying the polarized armature 57, (responsiveonly to positive line-currcnts,) is mounted upon its arbor 54, which ispivoted in standards 55 and 56. A slotted standard, 58, through whichlever 53 passes, has threaded in it the adjustingscrews 59 60, Fig. 7,by which the scope of motion of lever 53is governed. A depending arm,62, is secured in said lever, and to it is attached the usual elevating-sprin g 6].

In the two standards 63 and 64 is journaled the arbor 65, upon which arerigidly mounted the ratchets 66 and 67, the teeth of" each of which arearranged in the opposite direction to the other, as shown. A pawl, 68,pivoted to lever 53, engages ratchet 66, and by the vibratory movementsof said lever serves to actuate said ratchet, and therewith arbor andits several attachments. A relief-pawl, 69, secured to bed B, serves, byits contact with ratchet 66, to secure the same from retrogression, andthe free end oflever 53,formed as a pawl, as shown in Figs. 5, 6, 7, isengaged at each descent by'a tooth of ratchet 67 at the instant that theaction of pawl 68 ceases, thereby arrestiu g the rotary movement of saiddisks, and the scope of motion of said lever is such that said ratchetswill be advanced exactly the space of one tooth at each descent of saidlever.

- Upon shaft 65 are rigidly mounted the disks 72 and 73, the peripheryof 72 consisting of contact-surface, except the one short are ofinsulation, shown at 74, while the periphery of 73 consists ofinsulation, with the exception of the are 75, which is, in theory,coincident in extent with insulation 74, but in practice is slightlywider, to compensate for the inevitable variation in machinery and toinsure continuous contact with one or the other of said disks, whichsaid contact is effected by the an equivalent means. Upon the oppositeside of the ratchets a disk is mounted upon shaft 65, having two faces,respectively marked 7 9 and 80, and subdivided by a concentric groove,as shown. Said face 79 consists of two arcs of contact-surface separatedby the short arcs S1 of insulation. as shown in the detached elevations.Said face 80 consists of two arcs of insulation corresponding to thecontact-surface of 79 and separated by the short arcs S2 of contact; andthe contact-sprin gs 83 and 81, which respectively bear against saidfaces, as showii, are so arranged that when spring 83 is insulated by anare, 81, of face 79 spring Set is in contact with an are, 82, of face80, and when spring 83 is in contact spring 84 is insulated, both ofwhich conditions will occur twice at each revolution of said disk.

A pin, 85, is secured in ratchet 67 at such distance from its axis thatit will enter hole 97 in disk 79, while pin 86 secured in standard 64enters a hole, 98, in disk 80. Aspring, 90, secured to bed B andengaging the concentric groove in said disk, serves, when undisturbed,to engage the disk with pin 85, and when so engaged the disk revolvescoincident with shaft and its ratchets. To disengage said disk. from pin85 and engage it with pin 86 the telephone 94 is removed from lever 87,which is pivoted on stud 88, when the contractile force of spring 93will raise the long arm of said lever, thereby forcing the shortnon-conducting arm 89 against spring 90, which will slide the disk intocontact with said pin 86, when hole 98 in 80 is brought coincidenttherewith, as will be explained.

When the telephone is supported on arm 87, as shown, said arm is incontact with the vertical rod 91; but when released from said arm itrises into contact with rod 92, thereby breaking contact with 91, saidrods being provided, by means of springs, weights, or other means, withsuch limited automatic movement that said lever, when rising or falling,will not break existing contact with one rod until it forms contact withthe other, so that it is always in contact eitherwith one or both ofsaid rods.

A closed-circuit key, 95, of usual construction,is secured to bed B, anda contactbracket, 96, is arranged in the usual relation thereto,

as shown.

A dial, 71, is so secured to standard 63 that shaft 65 will projectthrough the central hole therein, and a pointer, 70, is rigidly securedto such projecting end of the shaft, and thus a positive current, whichrenders the machine operative. Said current enters by main-line wire 10,secured in cup 103, as shown, when, it spring 76 is in contact with disk72, as shown, it flows through wire 104, spring 76, disk 72, shaft65,standard 63,wire 107, helices 51 52, wire 108, standard 64:, shaft65, disk 80, spring Sat, wire 109, stud 88, arm 87, stop 91, wire 110,key 95, bracket 96, wire 111, cup 112, line-wire 10, and thence to nextstation. If lever 87 were in contact with rod 92 instead of 91, then,instead of the current passing through rod 91 to wire 110, it would passthrough rod 92, wire 116, telephone 94, wire 117, and thence by wire110, as in the other case. Said positive currents rendering the helicesoperative, the armature 57 is thereby actuated as the current isintermitted by the rotation of the interru 'iter-disk 18, Figs. 1, 2, asbefore described, thus reciprocating lever 53, which, by pawl 68, willactuate the ratchets 66 67 tooth by tooth, as before described, therebycarrying pointer forward one figure on dial 71 at each such movementofthe disks until said pointer arrives at thenumber on said dial whichcorresponds with the number of the office where it is situated. Whensaid pointer so arrives at its office number spring 76 will be thrownout of contact by insulation-arc 74 of disk 72, and spring 77 will atthe same time be brought in contact with are of disk 73, when the pathof the current will be as follows: By main-line wire 10 to cup 103, wireto polarized bell 113, by wire 106 to cup 114, wire to spring 77, disk73, shaft 65, standard 63, wire 107 to helices 51 52, wire 108 tostandard 64, shaft 65, disk 80, spring 84, wire 109, stud SS, arm 87.stop 91, wire 110, key 95, bracket 96, wire 111, cup 112, thence bymain-wire 10, which course of the current, if the same be changed tonegative by the pole-changer, Figs. 1, 2, will ring polarized bell 113,which is responsive only to negative currents, lever 53 remaininginoperative, as the polarized armature 57is notsusceptible toanegativecurrent.

1 willnow describe themode of signaling the main office from a minoroffice, the mode of calling the desired minor office from the mainofice, the mode of transmitting messages to the called ofitlces and noothers, the mode of restoring the indicators at the several stations tozero, and the means of restoring the said indicators to their properposition in case of their becoming displaced.

I will suppose that office No. 5 desires to communicate with office No.10, and that the pointer 70 at all the offices stands at zero on dial71, as shown in Fig. 3; that bell 113 and telephone 94 at the mainoffice Oarein circuit, and at such time the telephones at all the minorstations .are' in circuit and lever 1 of the polechanger is at stop 5,Fig. 1, thereby sending a negative current through the line, as beforedescribed. The operator at said office 5 will now actuate key 95, Fig.3, thereby ringing the single tapper-bell 113 in the main office. Hewill then release his telephone 94 from lever 87, and with the telephonehe will notify the main office that he desires to communicate withoffice No.10. Whereupon the operator in the mainoffice willmove lever 1from stop 5 to stop 6, thereby rendering theline-current positive, andwill next actuate the interruptercrank 15, thus making and breakingcontact between disk 18 on crank-shaft 16 and the contact-spring21,'as.before described, thereby sending an intermittent positivecurrent through the line, which will actuate the several instruments B,as described, until their respective pointers 70 indicate the desirednumber, l0, on dial 71 in each office,'whereupon lever 1 will bereversed to stop 5, when the negative current will actuate the singletapper polarized call-bell 113 in said office No. 10 as key 2 isactuated. and in no other oflice, which resultis accomplished in thefollowing manner:

When the pointer 70 is at zero, then in every minor ofice upon the linespring 76 is in contact and spring 77 is out of contact with theirrespective disks; but when the pointer in each office arrives at thenumber on its dial which corresponds with the line number of suchoffice, then spring 76 will be insulated and spring 77 in contact, thepointer at each office being so adjusted upon shaft in circumferentialrelation to arcs 71 and 75 of said disks, and springs 76 77 being ofsuch length that when the pointer arrives at the office-number upon thedial spring 76 is so insulated and spring 77 in contact, whereby thecurrent, instead of passing through wire 104, will pass through wire 105to the bell, which condition will exist at minor office 1 when ratchets66 67 have moved one tooth from zero and at office 2 when said ratchetshave so moved two teeth, but will then have ceased to exist at office 1by reason of the reversal of the contacts of said springs, (and sonecessarily at each office,) so that when the pointers reach 10 on thedials the connections with bell 113 will have been successively formedand broken at the offices numbered from 1 to 9, and such connection willthen only exist at said office numbered 10, whereby when the negativecurrent is sent through the line-wire, as already described, it willsound the polarized call-bell at said office No.10, while the bells atall the other offices are silent and as the said pointers at everyoffice on the line will so stand at 10, the respective operators thereinwill be thereby notified that the line is in use, which fact is alwaysindicated when said pointer is in any position except at zero, and theoperator at the calling-oftice 5 is also informed by the position of thepointer at 10 that his call has been received at and duly transmittedfrom the main office.

Upon the sounding of hell 113 in office 10, as described, the operatortherein will remove his telephone from lever 87, thereby bringing thetelephone into circuit, as before described,

and the desired communication will then be made between said office 5and office 10. When the operator at station 5 removed his telephone fromlever 87 the spring 93,'acting upon said lever, would slide thedouble-faced disk 79 80 into contact with the stationary pin 86,thnsreleasing it from pin 85, and thereby maintaining the then existingcontact and insulation of springs 83 S4 relatively to disk '79 80, assaid disk would be held stationary by said pin 86. But at all the otheroffices upon the line said disks would move coincident with theratchets, it being understood that the insulation-arcs S1 81 upon 79 andthe contactarcs 82 82 on 80 'at each office are arranged upon thecircumferential line of the disk at the same distance from each other ascorresponds with the angular distance from zero on dial 71 to theindicating number of such office. Thus, if there were nineteen officesupon the line with a dial marked from zero to 19, the arcs 81 upon theinstrument at office No. 10 would be arranged at one hundred and eightydegrees from each other, as would also be the contact-arcs 82 on disk80, in orderthat when the pointer reached 10 on the dial, which would behalf the circuit thereof, the contact and insulation of springs 83 84would atsuch oflice No. 10 be restored as beforethe movement of thediskcommenced, and with said disk in contact with pin 85. Then when theratchets move from zero one tooth at all the offices except No.1 thecontact and insulation of springs 83 84 would be'reversedthat is, thespring 63 would be brought into contact and spring Salinsulaied. \Vhenthe ratchets moved two teeth such reversal would take place at oflice 1,while the original condition would be restored at office 2; and thus asthe ratchets were moved forward the conditions of said springs would berestored, as at starting, at each office as the pointer reached theoffice number on the dial, and this by reason ofthebefore-describedcoincidence between the positions of the office numbers on the dialrelatively to zero and the distance apart of insulation-arcs S1 at thesame offices, and the coincidence of contact-arcs 82 relative to suchinsulation-arcs 81, as before described.

\Vhenever spring 83 is in contact the currents pass from disk 79 directthrough said .spring, and by wire 118 to cup 112, thereby avoiding thetelephone-arm 87 and its connections and key 95. After the exchange ofmessages, as described, or when time is up by the line rules, thecurrent is again changed to ]')OSlil"G, when the interrupter is actuatedand the pointer is moved forward to zero on its dial, which result willbe simultaneous in the main and all the minor offices, whereupon lever 1will be removed to stop 5, as at first.

When battery-telephones are employed in connection with my inventionthey will be operated by the negative current, and the bell employedwith such instruments will not, it is believed, be effected by thefluctuations caused by telephonic transmission but should the bell IIObe thereby affected a suitable switch may be arranged in connection withlever 87 to out out the bell, when arm 87 rises by reason of the removalof the telephone therefrom,

When magneto-electric telephones are employed with my said invention arm1 mustbe in central position, as shown in Fi 1, with cam 41 in a centralposition, as shown, while telephonic communication is being carried on,and at such time spring 36 will, as before specified, by its contactwith screw 38, close the circuit, while battery 13 will be thrown out.

If, from any cause, the pointer 70 of any machine upon the line shouldlose its coincidence of movement relativelyto the other machines,

. all such derangements of movement are rectitled by means of thefollowing devices:

A lever, 99, is pivoted at or near its center in standard 58, andcarries at one extremity a polarized armature, 100, which is so arrangedrelatively to the poles of the helices as to respond. to a negativelinecurrent. When armature 100 is released from said poles the oppositeend of said lever is seated upon stop 119 by the action of spring 120,thereby bringing the end of the lever into the path of pin 102 in theface of ratchet 66, a delicate angle-spring, 101, being so secured tosaid lever as to extend slightly beyond the end thereof, and yet, by itsyielding, allow said pin to be brought in direct contact with the end ofthe lever, which contact will occur at the moment when the pointer 70arrives at zero on its dial. Hence, if any of the pointers were out ofposition relatively to the others, all would be successively arrested bysaid lever and so brought into coincidence at zero. After such generalconnection or adjustment of said pointers a negative current is sentthrough the line-wire, thereby depressing armature 100 upon the poles ofthe helices and releasing the opposite end of the lever and its'springfrom pin 102, when by releasing the armature the opposite end of thelever will be sustained by spring 101, the angle whereof, which isparallel with the axis of the lever, will rest on 7 pin 102 until theratchets are again rotated.

By the term polarized armature I mean either a permanent]y-magnetizedsteel armature or a soft-iron armature polarized by the inductive actionof a permanent magnet.

Instead of a pole-shifter and battery at a main or central office only,the same may be located in every office upon the line, in which eventthe main office may be dispensed with; but I prefer the system ofemploying a central office with such battery and pole-shifter in suchoffice only.

I claim as my inventiou 1. In combination with operative rotativedevices, the double disk having faces 79 80 and removably connected withsuch rotary devices, such faces being each provided with the describedinsulation and contact arcs arranged upon the periphery thereof in thesame angular relation to each other as is the office number to thezero-mark upon dial 71, and the springs 83 84, with theirconnecting-wires, and so arranged that when the disk is carried forwardwith the rotary devices the conditions of the contact and insulation ofsaid springs will be reversed when the pointer moves from zero on thedial, but when said pointer is at its office-number upon said dial saidsprings will resume their first conditions of contact and insulation,whereby, when said pointer reaches its office-number in the office thatis called, the Contact and insulation of said springs and disks will cuse the C e to pass through the connections of telephonearm 87, asspecified.

2. In an electric indicator and automatic switch, the double-faced disk7 9 80, having the respective insulation and contact arcs, as described,and arranged to make and break contact with springs 83 84, as set forth,and having the holes 97 98 formed iii the respect ive planes of suchdisk in longitudinal coincidence, the pin 85, secured in ratchet 67, andpin 86, secured in standard 64, whereby when said disk is in contactwith pin 85 it is car ried around with said ratchet, but when in contactwith pin 86 it is held from rotation and the relative conditions ofcontact and insulation of said springs remain unchanged.

3. In combination with the double-faced disk 79 80, having the describedrespective insulation and contact surfaces or arcs, and arranged to makeand break contact with springs 83 84 and to be locked in position orcarried forward with ratchet 67, as specified, the spring 90, engagingin the concentric groovein said disk, and the an gle-lever S7, engagingsaid spring by its non-conducting arm, and so arranged that when pointer70 is at zero and telephone 94 is removed from said lever and such leveris raised by spring 93 said disk will, by said lever, be moved intocontact with pin 86, and be thereby held from rotation, therebymaintaining telephonic connection at the callingoffice, allsubstantially as specitied.

4. In combination with the double-faced disk 7 9 80, constructed andarranged to make and break contact, as specified, and to be carriedforward with the ratchets, or to be locked in position, as described,the angle-lever S7, pivoted at 88, formed with a lifting spring orweight and suitable stops to governthe scope of its movement, andarranged to engage and actuate said disk by its non-conducting short armwhen relieved of the telephone, substantially as specified.

5. In combination with the rotative devices, the lever 99, provided withits polarized armature 100, arranged relatively to the poles of thehelices, as shown, and with its angle-spring 101, and having a support,119, and so arranged relatively to stop 102 in the ratchet as to be inthe path thereof to arrest the movement of the ratchet when pointer 70is at zero on its dial, and when released from said stop by theattraction upon its armature to be supported above said stop 102 by thecontact and the contactsprings 76 77, with the de scribed conductingconnections of the said parts constituting the circuit, whereby byadjustin g said pole-changer a positive current may be first sentthrough the circuit, and may be rendered intermittent by actuating theinterrupter, thereby actuating said disks through the rotative devices,and thus successively re- I versin g the contact and insulation of saidsprings at the minor otfices upon the line as their said pointersindicate upon the dial their respective line numbers, and therebybringing the signal-bell atsuch offices into the circuit, so that whenthe number of the called office is so indicated at the main office thepolechanger may be reversed and the call may be sounded upon thepolarized bell in such indicated minor oflice by actuating theinterruptin g-key 2 without sounding such alarm at any other office, allsubstantially as specified.

7. The combination of a battery, a polechanger, an interrupter, apolarized bell, the disks 72 73, suitably mounted with rotary devicesand insulated from such devices, and constructed and arranged to makeand break contact, as specified, the fixed dial and the pointer mountedupon the arbor of said disks, and the rotary devices, the double-faceddisks 79 80, also mounted upon said arbor and having their describedarcs of contact and insulation, and arranged to be locked or rotated, asdescribed, the contact-springs to engage said disks, the telephone 94, akey, 95, and the described conducting-connections between said partsconstituting the circuit, whereby by adjusting said pole-changer apositive current may be first sent through said circuit and may berendered intermittent by actuating the interrupter, thereby, through therotary devices, actuating the disks 72 73 and bringing the polarizedbell of the called otfice into circuit to be sounded by actuating theinterrupter-key 2, whereupon by the reversal of the pole-changer anegative current may be sent through the circuit to ring said polarizedbell, when messages may be transmitted through the line-circuit by meansof said telephone, as before described.

8. In combination with the telephone 9; and its conducting-connections,the rotary disks 7 9 S0, with their described arcs of contact andinsulation, and the springs 83 84, with their connections, soconstructed and arranged that when the pointer is at zero on the dial orat its own office number upon such dial said spring 83 will be insulatedand 84 in contact, and when said pointer is in any other position thanat zero or its office-number spring 84 will be insulated and 83 will bein contact, whereby, when said pointeris so at zero or its officenumber,the current will flow through wire 109, and thence to the telephone, butwhen said pointer is in any position except atzero or its office-numberthe current will pass out by wire 118, thereby throwing the telephoneand signal-key 95 out of circuit, substantially as specified.

9. In an electrical apparatus, the combination of helices 51 52 withtheir respective poles, the vibrating lever 53,provided with itspolarized armature 57, arranged to be actuated by said helices, aratchet mechanism arranged to be actuated by said lever, and thesupplemental lever 99, provided with its armature 100, oppositelypolarized to that of lever 53, and arranged to be actuated by thehelices that actuate said lever 53, with suitable devices,

whereby said supplemental lever serves to intermitten tly arrest therotary movement which is imparted to said ratchets by the action of saidlever 53, substantially as specified.

WALTER J. DUDLEY. Witnesses T. W. PORTER,

GEO. H. JENKINs.

